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首页> 外文期刊>Journal of Colloid and Interface Science >Study of the coalescence/splash threshold of droplet impact on liquid films and its relevance in assessing airborne particle release
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Study of the coalescence/splash threshold of droplet impact on liquid films and its relevance in assessing airborne particle release

机译：液滴撞击液膜的聚结/飞溅阈值及其与评估空气中颗粒释放的相关性的研究

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Impingement of droplets on surfaces occurs in many industrial and natural processes. The study of droplet break-up is fundamental in order to determine the potential sources of airborne contamination for scenarios of hazardous liquid falls such as dripping. There are very few data in the literature describing the case of impact of millimetre-size droplets. The purposes of this work were to study experimentally particle emission during the impact of droplets on a liquid film and to assess the use of coalescence/splash relations to predict airborne particle release. The results are described using dimensionless numbers taking into account the inertial, viscosity and surface tension forces. Experiments were carried out for Weber numbers between 62 and 1754 and for Ohnesorge numbers between 2.0×10~(-3) and 1.5×10~(-2). New results on coalescence/splash thresholds are obtained using highly sensitive aerosol measurement and allow a prediction concerning the presence or absence of airborne particles according to a threshold relation. Moreover, we propose a modification of the Cossali et al.'s [1] relation in order to describe the coalescence/prompt splash threshold.
机译：在许多工业和自然过程中都会发生液滴撞击表面。为了确定诸如滴落之类的危险液体掉落场景中的空气传播污染的潜在来源，对液滴破裂的研究至关重要。文献中很少有数据描述毫米级液滴的撞击情况。这项工作的目的是通过实验研究液滴在液膜上的撞击过程中的颗粒排放，并评估使用聚结/飞溅关系预测空气中颗粒的释放。使用无量纲数描述了结果，并考虑了惯性，粘度和表面张力。对韦伯数在62和1754之间以及奥尼索格数在2.0×10〜（-3）和1.5×10〜（-2）之间进行了实验。使用高度灵敏的气溶胶测量可获得有关聚结/飞溅阈值的新结果，并根据阈值关系可以预测是否存在空气中的颗粒。此外，我们提出了对Cossali等人[1]关系的修改，以描述合并/提示飞溅阈值。

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